<!DOCTYPE HTML>
<html>
  <head>
    <style>
      body {
        margin: 0px;
        padding: 0px;
      }
    </style>
  </head>
  <body>
      <br/>
      
    <canvas id="myCanvas" width="1200" height="800"></canvas>
    <script>
      var canvas = document.getElementById('myCanvas');
      var context = canvas.getContext('2d');
      var i=0;
      
      context.beginPath();
      while(i<15){
          var j=0;
          while(j<15){
              context.rect(100+(37*i), 100+(37*j), 35, 35);
              context.fillStyle = 'white';
              context.fill();
              context.lineWidth = 1;
              context.strokeStyle = 'gray';
              context.stroke();
              j++
          }
          i++;
      }
      
      
    </script>
  </body>
</html>
